If poverty was an easy problem to solve, it would have been solved a long time ago.
Climate change is a complex challenge, and one that will not be easily solved.
I'd be the first to say that cybersecurity is a difficult and challenging matter.
That's the $64,000 question. And I would love to tell you there was an answer.
Self-esteem is such a challenging issue for young women.
[It is] one of the most complex and emotional issues of out time.
It is quite a three-pipe problem.
The naming of cats is a difficult matter
